Hi Y'all. Been experiencing an issue with my 92 5.2 D150 where at start up it runs fine for about a half mile or so and then seems to start wanting to buck and back fire. My thoughts are it is likely running in one loop when it is first started and then when it changes to some other mode or loop, which may take outside inputs it starts acting crazy.

I know for some shops early 90's Dodges are not easy to diagnose as they are not OBDII and I think required a special scan tool as well. Thought maybe some of my friends here on Moparts might be able to help point me in the right direction.

To save time, here is a list of things changed within the last couple years. Temp sensor, IAC, plugs, wires, cap rotor, fuel filter, MAF or what it MAP, coil. I also had the plenum gasket replaced a while back.

Also to add it does not seem to do this in warm weather.
Any thoughts are what could be causing the truck to act like this or what direction I should be investigating further. Any feedback is certainly appreciated.